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Consolidated Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net Sales					$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 211,746	$ 200,134	$ 216,828	$ 179,864	$ 1,003,066	$ 808,572	$ 811,799
Gross Profit					115,527	104,604	104,554	79,736	93,509	85,295	95,289	77,502	404,421	351,595	349,060
Net Earnings					$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	$ 15,370	$ 11,477	$ 15,328	$ 4,439	$ (6,195)	$ 46,614	$ 32,088
Basic (in dollars per share)					$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 0.88	$ 0.66	$ 0.88	$ 0.25	$ (0.35)	$ 2.66	$ 1.78
Diluted (in dollars per share)					(0.18)	0.20	(0.15)	(0.22)	$ 0.85	$ 0.64	$ 0.85	$ 0.25	(0.35)	2.59	1.74
Cash dividends declared per common share (in dollars per share)	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.20	$ 0.20	$ 0.20					$ 0.84	$ 0.81	$ 0.80

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Aggregate dividends declared during the period for each share of common stock outstanding.

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